<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bind Class & Style</title>
</head>
<body>
    <div v-bind:class="classObject"></div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14"></script>
    <script>
        var vm = new Vue({
            data: {
                isactive: true,
                error: null
            },
            computed: {
                classObject: function() {
                    return {
                        active: this.isActive && !this.error,
                        'text-danger': this.error && this.error.type === 'fatal'
                    }
                }
            }
        })
        
    </script>
</body>
</html>